Washburn guitar serial numbers are located on the back of the headstock on electric guitars and in the sound hole on acoustic guitars. In most Washburn guitars, the first two digits of the serial number indicate the year of manufacture.
Washburn has utilized a variety of serial number formats throughout its history. Guitars with serial numbers containing five or more characters were manufactured from the 1980s to the 2000s. Guitars with serial numbers containing five or less characters were likely manufactured in the 1980s, and serial numbers with four characters indicate that a guitar was manufactured in the 1970s or early 1980s. Washburn guitars manufactured before the 1970s have no serial number.